Reversible rotary motor



Get. 7, 1941.

P. VAN SITTERT ET AL Original Filed Feb. 23, 1939 ye/7w. A/GEL/V.

z x m v a W 6 N o x I? 5 i a r F a 3 Z w fl ww r F. W. wwww mn 2 H w w w Patented Oct. 7, 1941 UNITED STATES PATENT-OFFICE 2,257,893

Paul Van Sittel't,

Shaker Heights, Lloyd G.

- Speth, East Cleveland, and John H. Engeln, Cleveland, Ohio, assignors to The Cleveland Pneumatic Tool Company, Cleveland, Ohio, a

corporation of Ohio 1941, Serial No. 394,012

'iClaims. (Cl. 121-34) One object oi. this invention is to produce a fluid actuated rotary motor of the reversible type with manually operable means for controlling the direction of rotation of the motor.

Another object of this invention is to construct a fluid. actuated rotary motor of the reversible riginal application February 23, 1939, Serial No. 257,824. I Divided and this application May 17,

within the motor housing 220 via an inlet passage 34 provided through the valve 225.

Opening into the inlet chamber 33, there is a passage 38 controlled by a centriiugally operated governor valve 31 movable into open or closed position relative to an annular groove 38 aiiordtype wherein the parts are arranged and disposed in a manner producing a compact assembly which is strong, durable and eiilcient.

Other objects and advantages more or less ancillary to the foregoing reside in the specific construction and aggroupment of the elements peculiar to this structure, as will become apparent from a more complete examination of this specification.

In the drawing:

Fig. 1 is a longitudinal sectional view of a rotary motor embodying the invention.

Fig. 2 is a sectional view taken in a plane indicated by line 2-2 in Fig. 1.

- Fig. 3 is an enlarged sectional view indicated by line 33 in Fig. 2.

Figs. 4 and 5 are views similar to Fig.3 illustrating some of the movable parts in diflerent positions.

Fig. 6 is an enlarged side view of one of the parts shown in Fig. 2.

Referring to the drawing,'220 represents a motor housing having lateral extension 2| to which is secured by cap screws 22 a handle 23 extending laterally from the motor housing and having a handle grip 24 rotatable thereon. Rotatable within the extension 2|, there is a valve 225 having a stem 25 extending into the handle 23, which stem is secured to the handle grip 24 by a screw 21 movable within a slot provided through the handle 23. In the handle 23, there is also a throttle valve 28 operatively associated with the handle grip 24 through a pin connection 29 arranged and disposed in a manner causing longitudinal movement of the throttle valve 28 upon rotary movement of the handle 24. The handle 23 is terminated by a motive fluid connection 30 through which motive fluid may be admitted into the handle where its admission into the motor is controlled by the throttle valve 28 which is normally maintained against a valve seat 3| by a compression spring 32. From the throttle valve 28 motive fluid may ing communication between the passage 38 and an inlet passageway 239 formed within the extension 2| andcontrolled by the valve 225, which valve is rotatably mounted within a bushing 248 provided with four equally spaced radial ports 2, 242, 248 and 244, the port 244 being in constant communication with the passageway 239, while the port 242 is in communication with an exhaust port 245.

Vertically disposed within the housing 220, there is a stator in the form of a cylindrical sleeve 45 having rotatable therein a rotor 41 formed with shafted end portions 48 and 49, each journaled within an adequate bearing 58, the end portion 48 being provided with a'pinion 5|.- The rotor 41 is mounted eccentrically relative to the center axis of the stator 46 in line contact with the inner wall thereof as at 54 and carries radially movable vanes 55 capable of operative engagement with the inner wall of the stator 45, which stator is provided with two inletgrooves 56 and 51, one located on each side of the bearing line 54 and twosets of exhaust ports 58 and 59, one located on each side of the bearing line 54. Each set of exhaust ports includes a plurality of longitudinally spaced ports as shown in dotted lines at v 59 in Fig. 1.

there is accommodated a centrifugal governor 12 operatively associated with the governor valve 31 through a lever 13.

The peripheral wall of .the valve 225 is provided with two diametrically opposed slots 18 and 1|, the purpose of which will be explained later Between the slots 18 and 1| the peripheral wall of the valve is also provided with two smaller flats 83 and 84 disposed at from one another and capable of registration with the radially disposed ports 241, 244 and 243 formed through thevalve bushing 248. Internally, the be admitted into an inlet chamber 33 formed 55 casing 228-is provided with passageways 288 and 288, the former being in constant communication with the valve bushing port 2 and the latter with the port 243.

Located within the passageway 288, there is an arm 85 pivoted on a cross pin 88 and formed with an elongated exhaust control and 81 shaped to fit on the stator 48 to cover the exhaust ports 58 one of which is shown in Fig. 2. The other end 88 of the arm 85 extends through the port 2 of the valve bushing 248 in operative engagement with the normal peripheral wall of the valve 225.

Between the pin 88 and the end 88, the arm 85 is preferably reduced in cross section to enable a slight flexing of the arm while positioned as shown in Fig. 2, thereby assuring a fluid tight engagement of its end 81 with the stator 48. Located within the passageway 288, there is a similar arm 88 pivotally mounted on across pin 88 and formed adjacent the exhaust port 58 with a controlling end 8|. The other end 82 oi the arm 88 extends through the port 248 of the valve bushing 248 for engagement with the valve 245.

In the operation, the throttle valve 28 may be moved into open position relative to the valve seat 8| against the compression spring 82 by simply rotating the handle grip 24 in one or the other direction, thereby rotating the valve 225 connected to the handle grip 24 by the screw 21 into the position shown in Fig. 3 or 4, thus admitting motive fluid into the inlet chamber 83 through the port 34 of the valve 225, which will act on the governor valve 81 to shift it into open position as shown in Fig. l and enable admission of the motive fluid into the passageway 238 via the groove 38. This longitudinal movement of the throttle valve 28 upon rotary movement of the handle grip 24 is obtained by virtue of a helical groove formed within the handle within which is mounted the screw 28 connecting the handle grip to the throttle valve, and since that construction does not form a part of the present invention, no further description of the same is thought necessary.

With the valve 225 positioned as shown in Fig. 3, motive fluid from the passageway 288 is free to flow into the passageway 288 through the valve bushing port 244, the valve slot 18 and the valve bushing port 24|. From the passageway 288, motive fluid will be admitted into the stator 48 through the inlet slot 58, thereby acting on the vanes 55 for imparting rotation to the rotor 41 in a counterclockwise direction in Fig. 2. In this instance, the arm 85 has its end 88 engaging the normal peripheral wall of the valve 225 causing the other end 81 of the arm to be pressed against the stator 48 for closing the exhaust ports 58. In this position of the arm 85, the other arm 88 has its end 82 engaging the flat 84 formed on the valve 225, thereby enabling its other end 8| to be moved away from the stator 48 by the action of the pressure fluid exhausting through the ports 58, which-ports together with the stator slot 51 opens into the passageway 288 now in communication with the exhaust port 245 via the valve bushing port 243, the valve slot II and the valve bushing port 242. In other words, as the rotor 41 is actuated in a counterclockwise direction in Fig. 2, the pressure fluid acting on the end 8| ofthe arm 88 will shift that end into open position relative to the exhaust ports 58, thereby enabling the exhaust of the motive fluid through the ports 58 and also through the slot 51 via the passageway 288.

When it is desired to rotate the motor in the I other direction, the valve 228 may be rotated into the position shown in Fig. 4 for admitting motive fluid from the passageway 238 into the passageway 288 via the valve bushing port 244, the valve slot H and the bushing port 248. From the passageway 288 motive fluid will flow into the stator 48 through the slot 51 to act on the vanes 55 for actuating the rotor in a clockwise direction in Fig. 2. In this instance, the end 82 of the arm 88 engages the normal peripheral wall of the valve 225, thus causing the forcible engagement of the arm's end 8| with the stator 48 for the closing of the exhaust ports 58. In this position of the arm 88, the arm has its end 88 engaging the flat 88 Iormed on the valve 225, thus allowing motive fluid exhausted through the ports 58 to act on theend 81 of the arm 85 to move that end-away from the stator 48 for opening the exhaust ports 88 into the passageway 288 and enabling together with the groove 58, also opening into the passageway 288, exhaust of the motive fluid from the stator 48. In this instance, port 288 is in communication with exhaust port 245 through the valve bushing port 24 I, the valve slot I8 and the bushing port 242.

With the parts positioned as shown in Fig. 5, the corresponding position of the handle grip 24 will cause the throttle valve 28 to remain closed relative to the valve seat 8|, while the ends 88 and 82 of the arms 85 and 88 respectively engage the normal peripheral wall of the valve 225 for maintaining the arms in closed position relative totheexhaustportsfl and58.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminol y is not intendedio be restrictive or confining and it is to be further understood that various rearrangements of parts and modifications of structural detail may be resorted to without departing from the scope or spirit or the invention as herein claimed.

We claim:

1. In a fluid actuated rotary motor of the reversible type, the combination with a housing. 01' a stator within said housing having a rotor chamber, a rotor operatively mounted in said chamber, means for admitting and exhausting motive fluid into and from said chamber including a pair of inlet and a pair of outlet ports, a rotatable valve for selectively controlling admission of motive fluid through one or the other of said inlet ports, outlet ports controlling means pivotally mounted within said housing engageable with said stator for closing one or the other of said outlet ports, and means on said valve engaged by said outlet ports controlling means for actuating the same upon rotation of said valve.

2. In a fluid actuated rotary motor of the reversible type, the combination with a housing,

of a stator within said housing having a rotor chamber, a rotor operatively mounted in said chamber, arotatable handle extending from said housing, means for admitting and exhausting motive fluid into and from said chamber including a-pair oi. inlet and a pair of outlet ports, outlet ports controlling means pivotally mounted within said housing engageable with said stator for closing one or the other of saidoutlet ports, and means in said handle engaged by said outlet ports controlling means for actuating the sam upon rotation of said handle. a 3. In a fluid actuated rotary motor of the reversible type, the combination with a housing, of a stator within said housing having 'a rotor chamber, a rotor operatively mounted in saiding at least two outlet ports, outlet ports control-- ling means including an arm for each outlet port pivotally mounted in said housing, said arm having one end movable into opened or closed position relative to its respective outlet port, and movement effecting means for said arm operatively engaged by the other end thereof.

4. In a fluid actuated rotary motor of the reversible type, the combination with a housing, of a stator within said housing having a rotor chamher, a rotor operatively mounted in said chamber means for admitting and exhausting motive fluid into and from said chamber including a pair of inlet and a pair of outlet ports, outlet ports controlling means including a pair of arms pivotally mounted in said housing, said arms having one end movable int-o opened or closed position relative to said outlet ports, and movement ef-.

fecting means for said arms operatively engaged by the other ends of said arms for concurrently closing one and opening the other of said outlet ports.

5. In a fluid actuated rotary motor of the reversible type comprising a stator having .a rotor operatively mounted therein and ports through the stator including at least two outlet ports,"

tively engaged by the other ends of said arms for concurrently closing one and opening the other i of said outlet ports. I

6. In a fluid actuated rotary motor of the reversible type comprising a stator having a rotor operatively mounted therein and ports through he stator including at'least two sets of outlet ports, each of said sets including a plurality of longitudinally spaced ports, means for controlling said outlet ports including a pair of pivotally supported arms each having one end adapt- -ed to close all the ports of its respective set, and means operatively engaged by the other ends of said arms for closing said ports.

Z. In a fluid actuated rotary motor of the reversible type, the combination with a casing, of a stator within said casing having a rotor chamber, a rotor operatively mounted in said chamher, a pair of passageways in said casing leading 

